The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_peeloff.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 
   32 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $         */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/8.2/sys/netinet/sctp_peeloff.c 214462 2010-10-28 16:58:12Z tuexen $");
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_pcb.h>
   38 #include <netinet/sctputil.h>
   39 #include <netinet/sctp_var.h>
   40 #include <netinet/sctp_var.h>
   41 #include <netinet/sctp_sysctl.h>
   42 #include <netinet/sctp.h>
   43 #include <netinet/sctp_uio.h>
   44 #include <netinet/sctp_peeloff.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 
   48 
   49 int
   50 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
   51 {
   52         struct sctp_inpcb *inp;
   53         struct sctp_tcb *stcb;
   54         uint32_t state;
   55 
   56         inp = (struct sctp_inpcb *)head->so_pcb;
   57         if (inp == NULL) {
   58                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   59                 return (EFAULT);
   60         }
   61         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
   62         if (stcb == NULL) {
   63                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
   64                 return (ENOENT);
   65         }
   66         state = SCTP_GET_STATE((&stcb->asoc));
   67         if ((state == SCTP_STATE_EMPTY) ||
   68             (state == SCTP_STATE_INUSE) ||
   69             (state == SCTP_STATE_COOKIE_WAIT) ||
   70             (state == SCTP_STATE_COOKIE_ECHOED)) {
   71                 SCTP_TCB_UNLOCK(stcb);
   72                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
   73                 return (ENOTCONN);
   74         }
   75         SCTP_TCB_UNLOCK(stcb);
   76         /* We are clear to peel this one off */
   77         return (0);
   78 }
   79 
   80 int
   81 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
   82 {
   83         struct sctp_inpcb *inp, *n_inp;
   84         struct sctp_tcb *stcb;
   85         uint32_t state;
   86 
   87         inp = (struct sctp_inpcb *)head->so_pcb;
   88         if (inp == NULL) {
   89                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   90                 return (EFAULT);
   91         }
   92         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
   93         if (stcb == NULL) {
   94                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
   95                 return (ENOTCONN);
   96         }
   97         state = SCTP_GET_STATE((&stcb->asoc));
   98         if ((state == SCTP_STATE_EMPTY) ||
   99             (state == SCTP_STATE_INUSE) ||
  100             (state == SCTP_STATE_COOKIE_WAIT) ||
  101             (state == SCTP_STATE_COOKIE_ECHOED)) {
  102                 SCTP_TCB_UNLOCK(stcb);
  103                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  104                 return (ENOTCONN);
  105         }
  106         n_inp = (struct sctp_inpcb *)so->so_pcb;
  107         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
  108             SCTP_PCB_FLAGS_CONNECTED |
  109             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
  110             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
  111         n_inp->sctp_socket = so;
  112         n_inp->sctp_features = inp->sctp_features;
  113         n_inp->sctp_mobility_features = inp->sctp_mobility_features;
  114         n_inp->sctp_frag_point = inp->sctp_frag_point;
  115         n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
  116         n_inp->partial_delivery_point = inp->partial_delivery_point;
  117         n_inp->sctp_context = inp->sctp_context;
  118         n_inp->inp_starting_point_for_iterator = NULL;
  119         /* copy in the authentication parameters from the original endpoint */
  120         if (n_inp->sctp_ep.local_hmacs)
  121                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
  122         n_inp->sctp_ep.local_hmacs =
  123             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
  124         if (n_inp->sctp_ep.local_auth_chunks)
  125                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
  126         n_inp->sctp_ep.local_auth_chunks =
  127             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
  128         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
  129             &n_inp->sctp_ep.shared_keys);
  130         /*
  131          * Now we must move it from one hash table to another and get the
  132          * stcb in the right place.
  133          */
  134         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
  135         atomic_add_int(&stcb->asoc.refcnt, 1);
  136         SCTP_TCB_UNLOCK(stcb);
  137 
  138         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  139         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  140 
  141         return (0);
  142 }
  143 
  144 
  145 struct socket *
  146 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
  147 {
  148         struct socket *newso;
  149         struct sctp_inpcb *inp, *n_inp;
  150         struct sctp_tcb *stcb;
  151 
  152         SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
  153         inp = (struct sctp_inpcb *)head->so_pcb;
  154         if (inp == NULL) {
  155                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
  156                 *error = EFAULT;
  157                 return (NULL);
  158         }
  159         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  160         if (stcb == NULL) {
  161                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  162                 *error = ENOTCONN;
  163                 return (NULL);
  164         }
  165         atomic_add_int(&stcb->asoc.refcnt, 1);
  166         SCTP_TCB_UNLOCK(stcb);
  167         newso = sonewconn(head, SS_ISCONNECTED
  168             );
  169         if (newso == NULL) {
  170                 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
  171                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
  172                 *error = ENOMEM;
  173                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  174                 return (NULL);
  175 
  176         }
  177         SCTP_TCB_LOCK(stcb);
  178         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  179         n_inp = (struct sctp_inpcb *)newso->so_pcb;
  180         SOCK_LOCK(head);
  181         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
  182             SCTP_PCB_FLAGS_CONNECTED |
  183             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
  184             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
  185         n_inp->sctp_features = inp->sctp_features;
  186         n_inp->sctp_frag_point = inp->sctp_frag_point;
  187         n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
  188         n_inp->partial_delivery_point = inp->partial_delivery_point;
  189         n_inp->sctp_context = inp->sctp_context;
  190         n_inp->inp_starting_point_for_iterator = NULL;
  191 
  192         /* copy in the authentication parameters from the original endpoint */
  193         if (n_inp->sctp_ep.local_hmacs)
  194                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
  195         n_inp->sctp_ep.local_hmacs =
  196             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
  197         if (n_inp->sctp_ep.local_auth_chunks)
  198                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
  199         n_inp->sctp_ep.local_auth_chunks =
  200             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
  201         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
  202             &n_inp->sctp_ep.shared_keys);
  203 
  204         n_inp->sctp_socket = newso;
  205         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
  206                 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
  207                 n_inp->sctp_ep.auto_close_time = 0;
  208                 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
  209                     SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
  210         }
  211         /* Turn off any non-blocking semantic. */
  212         SCTP_CLEAR_SO_NBIO(newso);
  213         newso->so_state |= SS_ISCONNECTED;
  214         /* We remove it right away */
  215 
  216 #ifdef SCTP_LOCK_LOGGING
  217         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
  218                 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
  219         }
  220 #endif
  221         TAILQ_REMOVE(&head->so_comp, newso, so_list);
  222         head->so_qlen--;
  223         SOCK_UNLOCK(head);
  224         /*
  225          * Now we must move it from one hash table to another and get the
  226          * stcb in the right place.
  227          */
  228         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
  229         atomic_add_int(&stcb->asoc.refcnt, 1);
  230         SCTP_TCB_UNLOCK(stcb);
  231         /*
  232          * And now the final hack. We move data in the pending side i.e.
  233          * head to the new socket buffer. Let the GRUBBING begin :-0
  234          */
  235         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  236         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  237         return (newso);
  238 }

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